doc : None is a possible value for the options
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@ -89,6 +89,11 @@ name of the option are separated by dots: e.g.
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4. If an option is declared, and a value has been set, the returned value is
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the value of the option.
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What if a value has been set and `None` is to be returned again ? Don't
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worry, an option value can be "reseted" just by the affectation of the special
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value `None`. An option accepts a type value as a setting, but also `None` as
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a possible value.
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If you do not want to use the pythonic way, that is the attribute access
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way to obtain the value of the configuration option, you can also search
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for it recursively in the whole config namespaces with the ``get()``
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